Gauche is gravely injured in the fight against Dante which causes Asta's devil powers to go berserk.

He completely loses himself and relentlessly attacks Dante! But Dante becomes even stronger and Asta ends up on the ground. Then Captain Yami and Finral show up to the scene shocked and Yami is instantly enraged and joins the fight! Meanwhile, the Heart Kingdom is under attack by Vanica and her subordinates and the Spirit Guardians went to fight them, but Vanica's subordinates who had been given devil powers were far more powerful than expected, and...
It seems you've been sneaking around 
practicing and not doing your chores.
.يبدو أنّك كنت تتسللين وتتمرنين ولا تقومين بأعمالك المنزلية
Du scheinst deine Pflichten zu vernachlässigen
und heimlich zu trainieren, was?
Te vi practicando
en lugar de hacer tareas.
Te he visto practicando
en lugar de hacer tareas.
Paraît que tu sèches le ménage
et que tu t’entraînes en cachette ?
E così ti sei allenata di nascosto
invece di occuparti delle faccende di casa.
Parece que você anda pulando a
cerca e não está fazendo suas tarefas.
Похоже, ты вместо хлопот по дому
частенько практикуешь магию?